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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '147d70a87e19853e2a78557f8303c08ce08e87f5dd6e943ba369ece21d387311' 
  AND token = 'o3az4vZ370dc31Gdcp/XZa+85NJij0NuyjjnhJqPhvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}